Exercise machine



FIG. 1 is a front and right side perspective view of an exercise machine showing our new design;

FIG. 2 is a left side elevational view, the right side view being a mirror image thereof;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view;

FIG. 5 is a front elevational view; and,

FIG. 6 is a rear elevational view.

The handle bar has been shown fragmentarily in FIGS. 3, 5, and 6, for ease of illustration. 

The ornamental design for an exercise machine, as shown and described. 